2003 FORD MUSTANG Workshop Manual

clock tire type airbag disable fuel filter location MPG jack points

Page 3041 of 4378

FORD MUSTANG 2003 Workshop Manual If two substances of different temperature are placed near each other, the heat in the warmer
substance will transfer to the colder substance.
Latent Heat of Vaporization
When a liquid boils (conve

If two substances of different temperature are placed near each other, the heat in the warmer
substance will transfer to the colder substance.
Latent Heat of Vaporization
When a liquid boils (converts to a gas), it absorbs heat without raising the temperature of the resulting
gas. When the gas condenses (reverts back to a liquid), it gives off heat without lowering the
temperature of the resulting liquid.
Relative Humidity
The amount of moisture (water vapor content) that the air can hold is directly related to the air
temperature. The more heat there is in the air, the more moisture the air can hold. The lower the
moisture content in the air, the more comfortable you feel. Removing moisture from the air lowers its
relative humidity and improves personal comfort.
Effects of Pressure on Boiling or Condensation
As the pressure is increased on a liquid, the temperature at which the liquid boils (converts to a gas)
also increases. Conversely, when the pressure on a liquid is reduced, its boiling point is also reduced.
When in the gas state, an increase in pressure causes an increase in temperature, while a decrease in
pressure will decrease the temperature of the gas.
Compressor Anti-
Slugging Strategy
Liquid refrigerant may accumulate in the A/C compressor under certain conditions. To alleviate
damage to the A/C compressor, compressor anti- slugging strategy (CASS) is utilized.
CASS is initiated only under specific conditions:
zthe ignition is off for more than 8 hours
z the ambient temperature is above -4º C (25ºF)
z battery voltage is above 8.5 volts during engine cranking
When these conditions are present, the powertrain control module (PCM) will activate the A/C control
relay prior to cranking of the engine. The A/C control relay engages the A/C compressor for
approximately 4- 15 A/C compressor revolutions or a maximum of 2 seconds (depending upon vehicle
application), allowing the liquid refrigerant to be pushed from the A/C compressor. CASS is initiated by
the PCM regardless of the function selector switch position or the EATC system settings.
The Refrigerant Cycle
During stabilized conditions (air conditioning system shut down), the refrigerant is in a vaporized state
and pressures are equal throughout the system. When the A/C compressor (19703) is in operation, it
increases pressure on the refrigerant vapor, raising its temperature. The high- pressure and high-
temperature vapor is then released into the top of the A/C condenser core (19712).
The A/C condenser core, being close to ambient temperature, causes the refrigerant vapor to
condense into a liquid when heat is removed from the refrigerant by ambient air passing over the fins
and tubing. The now liquid refrigerant, still at high pressure, exits from the bottom of the A/C
condenser core and enters the inlet side of the A/C evaporator core orifice (19D990).
The A/C evaporator core orifice is the restriction in the refrigerant system that creates the high
pressure buildup upstream of the A/C evaporator core (19860) and separates the high and low
pressure sides of the A/C system. As the liquid refrigerant leaves this restriction, its pressure and
boiling point are reduced.
The liquid refrigerant is now at its lowest pressure and temperature. As it passes through the A/C Klj . 3 ba
112003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_2308/S3B~us~en~ ...

Page 3042 of 4378

FORD MUSTANG 2003 Workshop Manual evaporator core, it absorbs heat from the passenger compartment airflow passing over the plate/fin
sections of the A/C evaporator core. This addition of heat causes the refrigerant to boil (convert t

Page 3043 of 4378

FORD MUSTANG 2003 Workshop Manual Item Part Number Description
1 19D701 A/C charge valve port (low side)
2 19E561 A/C cycling switch
3 19C836 Suction accumulator/drier
4 19703 A/C compressor
5 19D644 A/C compressor pr

Page 3044 of 4378

FORD MUSTANG 2003 Workshop Manual System Air Flow Description
MAX A/C
When MAX A/C is selected:
�zThe air inlet door vacuum control motor is at full vacuum, closing off outside air and admitting
only recirculated air.
�z The pane

Page 3045 of 4378

FORD MUSTANG 2003 Workshop Manual �z
The panel/defrost door vacuum control motor is at full vacuum and the panel/floor door vacuum
control motor is at no vacuum, directing airflow to the instrument panel A/C registers. A small
amoun

Page 3046 of 4378

FORD MUSTANG 2003 Workshop Manual control motor is at no vacuum, closing off airflow to the defrost duct, side window demisters,
floor duct and instrument panel A/C registers.
�z The A/C compressor will not operate.
�z The blower m

Page 3047 of 4378

FORD MUSTANG 2003 Workshop Manual �z
The A/C compressor will operate if the outside air temperature is above approximately 6°C (43°
F).
�z The blower motor is on.
DEFROST
When DEFROST is selected:
�zThe air inlet door vacuum con

Page 3048 of 4378

FORD MUSTANG 2003 Workshop Manual Item Part Number Description
1 19980 Manual A/C control assembly
2 19E561 A/C cycling switch
3 19D594 A/C pressure cutoff switch (V6)
4 19D594 A/C pressure cutoff switch (V8)
5 12A650

Load next 8 pages

Page: < prev 1-10 ... 3009-3016 3017-3024 3025-3032 3033-3040 3041-3048 3049-3056 3057-3064 3065-3072 3073-3080 ... 4384 next >

headlights open gas tank parking sensors deactivate airbag coolant level wiper fluid